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Medium voltage distribution network two wire closed loop operation wire connecting method

A wiring method and two-wire technology, applied to electrical components, circuit devices, AC network circuits, etc., can solve the problems of power flow distribution, limited transfer capacity of loop closure units, unbalanced power flow, limited transfer capability of loop closure units, etc. , to achieve the effect of simple and easy control of power flow distribution

Inactive Publication Date: 2014-01-29
SHENZHEN SHENGNENG ELECTRIC POWER SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The petal connection method in Singapore has the problem of limited transfer capacity between ring-closing units due to unbalanced power flow distribution;
[0004] The loop-closing connection method adopted by Hong Kong CLP Power Co., Ltd. also has the problem of limited transfer capacity between loop-closing units, and also suffers from the problem of unbalanced power flow when the loop-closing unit "N-1" fails and operates normally. , resulting in a large difference between the actual load rate of the ring closing unit and the theoretical maximum load rate

Method used

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  • Medium voltage distribution network two wire closed loop operation wire connecting method
  • Medium voltage distribution network two wire closed loop operation wire connecting method

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Embodiment Construction

[0030] The present invention is further described below in conjunction with accompanying drawing and embodiment:

[0031] Such as figure 1 As shown, a medium-voltage distribution network two-wire closed-loop connection method includes two first substations and second substations running in parallel, and is characterized in that,

[0032] The first substation includes a first main transformer A1, a second main transformer A2, a third main transformer A3, and a fourth main transformer A4, and adopts a single-bus four-section connection mode on the low-voltage side, wherein the first main transformer A1 and the second main transformer A2 run in parallel, the bus section DL11 and the bus section DL12 are connected through a normally closed switch K15, the third main transformer A3 and the fourth main transformer A4 run in parallel, and the bus section DL13 It is connected with the bus section DL14 through the normally closed switch K16, and the bus section DL12 is connected with ...

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Abstract

The invention discloses a medium voltage distribution network two wire closed loop operation wire connecting method comprising a first transformer substation and a second transformer substation. The medium voltage distribution network two wire closed loop operation wire connecting method is characterized in that the first transformer substation comprises a first main transformer and a second main transformer which are operated in parallel, a third main transformer and a fourth main transformer which are operated in parallel; the second transformer substation comprises a fifth main transformer, a sixth main transformer, and a seventh main transformer and an eighth main transformer which are operated in parallel; circuits from buses of two main transformer operated in parallel are connected with each other to form closed loop units. Transferring capacity between the closed loop units in the medium voltage distribution network can be flexibly configured according to power supplying reliability, flow distribution is simple and easy to be controlled, longitudinal differential protection is adopted in the medium voltage distribution network, so that N-1 is generated in the medium voltage distribution network and fault points can be rapidly separated to restore power supplement during the fault, and an equipped automatic system can be utilized to realize intelligentialization of switching operation, so that the switching operation can be utilized to restore power supplement during N-1-1 and N-2 faults; the medium voltage distribution network two wire closed loop operation wire connecting method is simple in structure and convenient to operate and implement.

Description

【Technical field】 [0001] The invention relates to a second-line closed-loop connection mode of a medium-voltage distribution network. 【Background technique】 [0002] In order to meet the user's increasingly high demand for power reliability, the medium-voltage distribution network has developed a large number of wiring methods, which can be roughly divided into open-loop operation mode and closed-loop operation mode according to different operation modes. The Singapore petal connection method and the ring connection method adopted by Hong Kong CLP Power Co., Ltd. are more mature in the application of the mode, but there are still some defects or deficiencies in the above ring connection method: [0003] The petal connection method in Singapore has the problem of limited transfer capacity between ring-closing units due to unbalanced power flow distribution; [0004] The loop-closing connection method adopted by Hong Kong CLP Power Co., Ltd. also has the problem of limited tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
Inventor 盛山青王涛
Owner SHENZHEN SHENGNENG ELECTRIC POWER SCI & TECH
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